MTG came out in 1993, it is the grandaddy to all those other CCGs and has most of the copyrights.
The pokemon card game was also published by wizards of the coast.
I'm not a legal expert, but if I see the similarities I'm sure others will too.
There is no copyright on simple playing cards, but there is a big fat one on Magic The Gathering and its 'Mana' driven play style.
I have plenty of popcorn, I just hope ,for my compet deeds sake, that this has already been researched by MindArk!